How we research

Source hierarchy

Not all sources carry equal weight. We rank them like this:

1. Peer-reviewed primary research — randomized controlled trials, organ-culture studies, and meta-analyses indexed in PubMed / PMC, the Cochrane Library, or major dermatology journals (JAAD, JID, Skin Appendage Disorders, J Cosmet Dermatol).
2. Clinical and regulatory bodies — the American Academy of Dermatology, NIH Office of Dietary Supplements, FDA Safety Communications, and analogous bodies internationally.
3. Established cosmetic-chemistry references — Robbins Chemical and Physical Behavior of Human Hair (5th ed.), Draelos Cosmetic Dermatology, and the CIR (Cosmetic Ingredient Review) safety assessments.
4. Trade and industry publications — Cosmetics & Toiletries, SOFW Journal, IFSCC papers. Used for formulation context, not efficacy claims.
5. Brand claims — used as inputs for our ingredient analyzer, never as evidence.

Product scoring

Every product on a /best ranking is scored automatically from its ingredient list, not from marketing copy. The scoring functions are open source and live in packages/lib/src/ingredient-analyzer.ts. The rubrics that compose a final ranking depend on the page:

• Damaged-hair conditioners — emollient + humectant balance (35%), slip + cuticle smoothing (25%), protein-moisture ratio (25%), weight-for-density (15%).
• Damaged-hair shampoos — surfactant gentleness (40%), pH range (20%), conditioning agents in the cleanser (20%), bond-builder pairing (20%).
• Bond-builder claims — flagged only when the formula contains an active with a peer-reviewed bond-rebuilding mechanism (maleic acid, succinic acid derivatives, citric-acid bond complexes, oligopeptide bond systems). Marketing copy alone is not enough.
• Damage-type tagging — chemical, heat, and mechanical damage signals are detected from the ingredient deck. A formula can carry zero, one, or multiple tags.

Rankings are re-tested every 90 days against current formulations. Six of last year's top picks dropped after silicone-load changes in Q3 2025 — the lists move.

Editorial review

Pages tagged "Reviewed by the Rituala Research team" are drafted, fact-checked against the source hierarchy above, and reviewed by a second team member before publishing. We do not claim medical authorship and we do not put fake credentials on pages — when a licensed cosmetic chemist or trichologist reviews a page, we name them and link to their credentials. Until then, attribution stays at the team level.

Every page carries a "Last reviewed" date. Pages with health implications (ingredient mechanism, supplement dosing, drug and lab-test interactions) are reviewed at least every 6 months.

Conflict of interest

Some product links on Rituala are affiliate links — if you buy through them we may earn a small commission, at no extra cost to you. Affiliate status does not influence rankings. Concretely:

• Scoring functions run before any affiliate-status check. The ranking algorithm has no access to commission rate.
• We rank products that have no affiliate program when they earn the spot — this happens in roughly half of our damaged-hair top picks.
• We accept no payment, free product, or sponsorship in exchange for placement. We never have.
• Affiliate links are disclosed inline next to the "Buy at" button on every product card.

Corrections

If you spot something wrong, email research@tryrituala.com. Substantive corrections are noted in the page changelog at bottom-of-page; the "Last reviewed" date updates on publish.